Don't show attendee status for Exchange events
* There are serious issues with showing consistent and accurate attendee
status for Exchange 2007 events
* Unless and until these can be resolved, it is better to simply not show
the user the supposed attendee status (since it might well be wrong)
* In this CL, I never set the attendee status; therefore, it will appear
"unknown" and be shown simply as "Guest" when viewing the Event in the
Calendar app.
* Will create tracking bug for this, so that we can revisit for a later
release.
Bug: 2524410
Change-Id: I97fdd26750c68ff25bbb102547071c728e4124a9